Electric welding transformer



(No Model.) f

H. LEM?.

ELECTRIC WELDING TEANSEORMEE.

N0. 440,6404 Patented Non 18, 1890.4

UNITED 4STATES PATENT OFFICE.

HERMANN LEMP, F LYNN, MASSACHUSETTS, AssIGNon To THE THOMSON- ELECTRIC .WELDING COMPANY, OF MAINE.

steeg-mo WELDING TRANSFORMER.

srncmeanorr rm-mngpea of uqam Patent No. 440,640, dem November 1e, leso.

Applicata una Apen 1s, 1ste.

t for the purpose of heating the same and reducing it to thed'e'sired condition of plasticity, as inelectric welding, forging, soldering, riyeting, and other operations,

My invention is, however,

dering', forging, and such class of work in. which the areas of material t0 beheated at once are large or extended or subdivided, and which, owing to want of uniformity .of contact or conducting capacity at diierent parts l 0f thework, are liableto heat' nnevenly.

My invention consists, essentially, in securing uniform heating at different parts of the work by supplying the different parts of the work from dierent sources of energy and regulating the dierent sources ndependcntly of one another, t. t

My invention consists, further, in a novel construction of compound transformer forming the source of heating-currents, as hereinafter described, and especially adapted for supplying currents 'of regulable amount to the different sides or parts of the work. t My invention consists, also`, in means for regulating the current-dow to different parts of the primary of said transformer.

My invention` consists, also, in the construc- 4tion of` the clamping or holding devices for the work, whereby two separate joints to be welded may be more 'readily furnished with separate currents in parallel.

In a transformer constructed in-accordauce with my invention I obtain the practical advantages ofl two separate transformers by winding or applying two separate sets of prima v and secondary tothe sameiron core, and com ining with such core amagnetie bridgepiece passing across from one side to the other thereof Iand adapted to form a'path for-the i designed more: particularly for use in electric vreldinggsot-L snm sa 348,153. m0 man.)

magnetic energy of the core when the current ofv a primary is varied, as hereinafter more particularly'described.

Other features of construction will be more particularly hereinafter described, and then specified in the claims.

weldingas applied to the formation of two separate joints or welds simultaneously in workJ-it is diicultto make both sides heatat the same rate and reach the welding-pointat the same time, owing to the difference in the ijoints.

In the accompanying drawings, Figure 1 is a side elevation of a portion of 'a transformer invwhi my invention is embodied. Fig. 2 is a side elevation of the same part from the opposite side. Fig. 3' is an edge view of a transf rmer embodying my invention and connected up to the devices hereinafter'described and claimed for' varying or regulan,

ing the action. Fig. 4 illustrates'a modification in the regulating device. 'Fig 5' illustrates the extension of the idea to three'separate sets of primary and secondary conductors.

In Fig. 8l have shown two secondary conductors A B .each having a primary wind-ing. Each secondary is preferably constructed, as illustrated in Fig. 1, from a casting of copper, forming a solid copper bar having a groove in its side, in whichlies the primary conductor through both of the secoudaries, as shown, so-

ors. Thecoils of .the primary are connected into circnit, so that they wiil act in the same;

producing a consequentpolo at any point, they act conjointly to'prodnee a-magnetio intimacy of contact between the two proposed P. The copper bar is slit at one side, and at,

that there is in eiect but one core-piece for' both sets of primaryI and secondary conductdirection or tend to magnetize the iron ore. in the same way. ,In other words, instead o! The transformer devised by me is especially l adapted for use in the process of electric.

parallel, as in a chain-link. In this .class ofare provided with an iron core I, made, as usual, of laminated -iron.. Thisoore pv roo circuit having' no consequentpole. Between the two sides of the core I is placed a bridgepiece of iron I', connecting the two sides of the core and adapted toform a path for the magnetism across from one side to the other in case of disturbance of the equality of magnet-ic potential at opposite sides of the core. The inner side of 'each secondary bar or conductor S, at its upper and inner side,l isbevergy from each source A B Yaccording to the requirements of diterentparts of the work, I propose to regulate the current owing in the primary circuits of the secondaries S, for which purpose Lemploy an apparatus constructed as follows and placed in the connection from the source G, which istypical of any source ot alternating currents and which supplies the primaries in multiple. The regulating device operates after' the manner of a reactive coil or counterjelectro-motiveforce generator, and is composed -of an iron ring M, preferably laminated and havin-g two coils A B' wound upon it at different parts and connected into the circuits of the two primary coils. 4

O indicates a conducting hand or circle of copper which encircles the core M, and preferably consists of a. copper cast-ing. By varying the relation of this ,closed conductor to the reactive coils the reactive 'ipower of 'the latter u pon the currents flowing through them may be made to vary, as now. well understood in the art, the reaction being less when the conductorO is ove'rthe coi lA' or B", and gradually increasing as it is moved a ay from coincidence with such coil.

ductor O, an iron armature T, which fills theA space Within the core and coils 'A'.B, and is preferably mounted on a een ter,soas to adapt it to form a support for theconductor 0, which, by means ofA a suit-able handle, may be then moved to any desired position on the core and coils. The iron armature T willobviously form .an armature for the coils in whatever position the conducto-rl O maybe placed. The coils A B' are so wound or connected that the lines of force generated by each in the core will tend to take paths (shown by the arrows) through the armature T. lVith ,this construction it is obvious` 'that as the conductor O is moved toward one coil A or B and away from t-he other the action of bot-h coils will be simultaneously varied. 'It

is obvious, likewise, that. instead of a single conductor O two conductors might be employed, as indicated in Fig. 4-one for each coil. The two conductors would obviously.

Fig. 3.

The half-link K or other device the two sides or parts ot'which are vto be heated equally is placed'in position on the clamporl clampslide, as shown in Fig. 3, so that each side or part will `be supplied with current from a separate part of the apparatus. The coils of the two secondaries being so wound V act in the same way as the lone conductor,

and connected as to act inthe san1e-direction,

the iron core will be magnetized with a difference of magnetic potential between l and 2 the same as between 2 and 3, and. the lines l of' magnetism will lpass from 1 to 3 directly and circulatecthrough such core as aA closed iron circuit,'very few, it any, going through the iron 'bridge I. Currents of equal potential will now be induced in thetwo sources of energy A B, and will feed-.equal "curr'nt, to

thetwo parts of the work, it being supposed'l that the regulating devices are iu properfposition to permit current to` ow ,in 'equal amount through the two primaries If, now,

'for any reason the side of the work fed from A should heat faster thanthat fed from' -B, the reactive device would be adjusted by moving the conductor` 0 toward the reactive coil B', thereby decreasing the-reactive 4ieleet oi that coil and increasing that' of- A', .so as. to ylncrease the current-in the primary of Bfsndd creasethe current in the primary of. '45.;11T'he magneticpotential at the point 2 is thereby raised as compared with point 3, andextra lines of magnetisml will take a short pat-h through thel iron bridge 'and backto their source, thus permitting the 'side o l the appa 'ratus B to work freely in settingmp, greater.

electrical energy alternating current. .v

.It is obvious lthat my .invention is .nothin-,y .ited to any particular uumbervof dilcrent under the influence of the'` electric sources independently eontroll' .f `as described, nor to any particular construction 0f transformer. secondary.

The same plan of providing asingle core.:`

for two sets of primary and secondary conf,v ductors and furnishing a magnetic bridge-` piece I foi` operation, l as just described, might obviously be extended toany number of primaries and secondaries having the same iron, core. Thus,as indicated in Fig. 521 have shown three seeondaries A B C, arrangedY in parallel 'and supporting or connected to'a lclamp rest orsupport H, which might beused for holding or supporting a sheet of metal and B is indicated at I. l

Itis obvious that the construction of compound transformer for use in connection with means for regulating the current in each part of the primary would be useful in any case where it is desired to regulate the energy furnished' from different parts or sections of the secondary conductors wound on the common core..

Itis obviously not necessary that the re-Y active devices should be constructed-so that the 'reaction in one branch or primary circuit will be diminished when that of. the other is increased, and vice versa; but it` would be possible in conj unction with the transformer,

constructed as described, to vary the reaction of each device in each primary inde pendently of the others or to vary the current in such primaries in any other desired manner. Thus, for instance, as shown in Fig. 5,

each primary might have a variable shunt independent of the' other. I prefer, however, to employ an arrangement auch as shown in Fig. 3 for varying the reaction. Whatever the nature o f the devices for varying the cnrrent-flow in the several primaries or sections of primary, they are simply to be manipulated so as to vary the ene of the different sources, and thereby con the heating at the different portions of the work.

What I claim as my invention is 1. The combination, in a transloia, of

the two or more secondary bars or conductors and primaries therefor, anl iron core common to said secondares and primaries, and an iron bridge-piece connecting the sides of the core, as andfor'the pri-pose described.

2..'lhecom'bination, thacomponndtransformer comprising two or more secundarias and corresponding rimariestheretorapplied at different parts o a common iron core and having magnetic bridges from one sidetothe other of the core, of means for re ting the current-dow in the primaries in ependently of one another.

3. The combination, with the divided workholder, of the. independent sources of .electricity supplying heating-current thereto, and

'means for increasing the energy of cnesrce.

wbilesimultaneonsly decreasing ,the energy o! the other source.

4;. The combinsticn, in an electric metal. werking apparatus, of two or 'more sources of energy sgpplyingdiilerent parts of the work in parall and means for regulatingthe en'.- ergy of the several sources independently o one another.

6. The combination, with the two primaries having secondaries connected-tc different por- 'varying the energy of said sources so as to tions of the samework in parallel, of two reactive coils in the circuit, respectively, of said coils and wound on the same'core, and a regu.- lating closed circuit of copper applied to saidcoils and core, as and for the purpose described.

6. The combination, with two or more sets -of primary and secondary conductorswound on the same core, which is provided with magnetic bridges from one side to the other thereof, of a source of alternating-current supply and reactive devices connected to the circuits of said primaries, whereby the current iiowing in a prmarycoil may have its strength in? creased or diminished at pleasure.

7. The'conibination, with the two reactive coils in diierent circuits, of a common iron Ycore upon diierent portions of which said coils are wound, an armature, and one ormore closed conducting bands or circuits adjustable with relation to the coils, so as to in- 'crease the selfinduction of one and simultaneously decrease the selfinduction of the other.

8. In an electric inetalworking apparatus, the combination, with the work, of different sourcesofenergy supplyingthe different parts or portions thereof in parallel, and means for control the relative heating of .the several 'parts of the work.

9. In anelectric metal-working apparatus, a work-holder made in two or more parts insulated from-one another and connected, respectively, with separate regulable sources of electric energy.

10. In an electric metal-working apparatus, the combination, with a divided clamp or work-holder, of secondary bars or conductors in contact, respectively, with the divisions of the holder.

11. The combination," in an electric metalworking apparatus, of a clamp-slide or base divided into sections insulated from one an other on a longitudinal line, and two secondary bars with which the sides ci the clampslide engage, respectively.

12. The combination, with the separate parl -bevel at their inner sides, of a V-shaped clamp-slide bearing on said secondariea at their beveled portion. as and for the purpose dsscribcd.-

Signed at L ynn,'in the county of Essex and State et Massachusetts, this 14th day oi April,

' HERMANN LEM?, Witnesses:

- Jcmt W. Gmsounr,

: Enum' Tnolssoxr.

IOO 

